CVE-2019-19726

 

Published at: - 12-12-2019 02:15

Last modified: - 30-01-2023 09:00

Total changes: - 2

Description

OpenBSD through 6.6 allows local users to escalate to root because a check for LD_LIBRARY_PATH in setuid programs can be defeated by setting a very small RLIMIT_DATA resource limit. When executing chpass or passwd (which are setuid root), _dl_setup_env in ld.so tries to strip LD_LIBRARY_PATH from the environment, but fails when it cannot allocate memory. Thus, the attacker is able to execute their own library code as root.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

 

Verification logic

 

Reference

• https://www.openbsd.org/errata66.html
• https://www.openwall.com/lists/oss-security/2019/12/11/9
• 20191212 Local Privilege Escalation in OpenBSD's dynamic loader (CVE-2019-19726)-Exploit, Mailing List, Third Party Advisory
• http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.html
• 20191213 Local Privilege Escalation in OpenBSD's dynamic loader (CVE-2019-19726)-Exploit, Mailing List, Third Party Advisory
• http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privilege-Escalation.html

 

Keywords

NVD

 

CVE-2019-19726

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures